Perhaps
the best value in a Home THX Ultra-certified amplifier to be found anywhere.
This John Curl-designed amplifier brings out all the subtle details
of your music, yet still has the punch for the boldest crescendos and
home cinema special-effects explosions. It also features automatic turn-on,
making it ideal for home theaters and custom, multi-zone installations.

Although it looks like there are two sets of inputs on our stereo
amplifiers, there is actually only one set. They are labeled INPUTS.
The other set of connectors are labeled LOOPING OUTPUTS. These would
be used to send the stereo signal on to another amplifier. Daisy
chain several amps to run multiple pairs of speakers. Do not use
the LOOPING OUTPUTS as an input.

What would sound better in my audiophile system?
Two HCA-1000As in mono or one HCA-1500A in stereo?

The HCA-1500A run in stereo should sound better since it has MOSFETs
in the driver stage. Better parts, smoother sound, more detail,
etc.

Where should I set the volume controls on
the back of my amp?

Under normal conditions you should turn them all the way to allow
full power output from your amp. However, if you need to match the
volume output of one of our stereo amps with another brand (BiAmping)
you could adjust them accordingly.

Will these amps handle a four ohm speaker
while the two channels are bridged to MONO?

No. Remember amps bridged to mono will "see" half the
impedance the speaker is actually presenting. Sustained 2 Ohm loads
are not advisable with any Parasound amplifier.

How many pairs of speakers can I run off a single stereo amplifier?

Usually we recommend you only run one pair of speakers, either 8
ohm or 4 ohm. For the safest multi pair installation, you could
use a speaker switching box, like our SPS-140,
to safely handle the load the speakers will present. Plus it will
give you more control over which pairs are playing.

What does the "A" stand for at the
end of the model name?

Auto-turn on. It means these amplifiers have 12V triggers that allow
a preamp to activate them remotely. Some kind of triggering
device is necessary for 12V activation.